/* 
   Art History Blog - Da Vinci & JSTOR Style 
   Author: AI
*/

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;700&family=EB+Garamond:ital,wght@0,400;0,600;1,400&family=Playfair+Display:ital,wght@0,400;0,700;1,400&display=swap');

:root {
    --bg-dark: #12100d;
    --parchment-base: #ebdcb2;
    --parchment-light: #f5eedc;
    --parchment-dark: #d2bc86;
    --ink-color: #3b2c24;
    --ink-faint: rgba(59, 44, 36, 0.3);
    --gold: #aa8844;
    --text-primary: #2a221b;
    --text-muted: #5e4c3b;
    --book-width: 45vw;
    /* 调整宽度以适应两页并排 */
    --book-height: 80vh;
    --book-max-width: 600px;
    --book-max-height: 850px;
    --perspective: 2500px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    font-family: 'EB Garamond', serif;
    color: var(--text-primary);
    overflow: hidden;
    /* 防止翻页时的视差滚动条 */
    height: 100vh;
    width: 100vw;
}

/* =========================================
   1. INTRO ANIMATION (Da Vinci SVG + JSTOR vibe)
   ========================================= */
#intro-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: transform 1.5s cubic-bezier(0.77, 0, 0.175, 1), opacity 1.5s ease;
    background-color: var(--parchment-base);
}

.parchment-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    background-image:
        radial-gradient(circle at center, transparent 0%, rgba(50, 30, 10, 0.4) 150%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");
    z-index: 0;
}

.svg-wrapper {
    position: relative;
    width: 55vmin;
    height: 55vmin;
    z-index: 1;
}

/* SVG Path Drawing Animations */
#davinci-svg {
    width: 100%;
    height: 100%;
}

.davinci-text {
    font-family: 'Cinzel', serif;
    fill: var(--ink-color);
    font-size: 24px;
    letter-spacing: 5px;
    opacity: 0;
    animation: fadeInText 2s 4s forwards;
}

.draw-group path,
.draw-group line,
.draw-group circle,
.draw-group rect,
.draw-group polygon {
    fill: none;
    stroke: var(--ink-color);
    stroke-linecap: round;
    stroke-linejoin: round;
}

.path-slow {
    stroke-width: 1.5;
    stroke-dasharray: 4000;
    stroke-dashoffset: 4000;
    animation: drawLine 6s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

.path-medium {
    stroke-width: 1.2;
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    animation: drawLine 4s 1s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

.path-fast {
    stroke-width: 1;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 2s 2s cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
}

.path-complex {
    stroke-width: 0.8;
    stroke-dasharray: 5000;
    stroke-dashoffset: 5000;
    animation: drawLine 7s 0.5s cubic-bezier(0.6, 0.0, 0.2, 1) forwards;
    opacity: 0.6;
}

.path-bold {
    stroke-width: 2.5;
}

.path-faint {
    stroke: var(--ink-faint);
}

.ink-blot {
    fill: var(--ink-color);
    stroke: none !important;
    opacity: 0;
    animation: blotFade 1s 5s forwards;
}

@keyframes drawLine {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes fadeInText {
    to {
        opacity: 0.8;
    }
}

@keyframes blotFade {
    to {
        opacity: 0.7;
        transform: scale(1.2);
    }
}

/* Intro UI Texts */
.intro-title {
    margin-top: 2rem;
    text-align: center;
    z-index: 2;
    font-family: 'Cinzel', serif;
}

.intro-title h1 {
    font-size: 3rem;
    color: var(--ink-color);
    letter-spacing: 0.2em;
    margin-bottom: 0.5rem;
}

.intro-title p {
    font-family: 'EB Garamond', serif;
    font-size: 1.2rem;
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.fade-in-text {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 2s forwards;
}

.delay {
    animation-delay: 5.5s;
}

.delay-2 {
    animation-delay: 6.5s;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#enter-blog {
    background: transparent;
    border: 1px solid var(--ink-color);
    padding: 12px 30px;
    font-family: 'Cinzel', serif;
    font-size: 1rem;
    color: var(--ink-color);
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

#enter-blog::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--ink-color);
    transition: left 0.4s ease;
    z-index: -1;
}

#enter-blog:hover {
    color: var(--parchment-base);
}

#enter-blog:hover::before {
    left: 0;
}

/* Intro Leave Animation */
.intro-leave {
    transform: scale(1.1) translateY(-100vh);
    opacity: 0;
    pointer-events: none;
}

/* =========================================
   2. BOOK & PAGE TURN LAYOUT (The Core)
   ========================================= */
#blog-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--parchment-base);
    background-image:
        radial-gradient(circle at center, transparent 0%, rgba(50, 30, 10, 0.2) 150%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");
}

#blog-wrapper.hidden {
    display: none;
}

.book-container {
    perspective: var(--perspective);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.book {
    position: relative;
    width: calc(var(--book-width) * 2);
    height: var(--book-height);
    max-width: calc(var(--book-max-width) * 2);
    max-height: var(--book-max-height);
    transform-style: preserve-3d;
    transition: transform 1s cubic-bezier(0.645, 0.045, 0.355, 1);
    /* Initial state, cover centered */
    transform: translateX(25%);
}

/* Transition class for when book is open (moves to center) */
.book.open {
    transform: translateX(0);
}

.page {
    position: absolute;
    width: 50%;
    /* Each page is half the book width */
    height: 100%;
    top: 0;
    right: 0;
    /* Align pages to the right side initially */
    transform-style: preserve-3d;
    transform-origin: left center;
    transition: transform 1.5s cubic-bezier(0.645, 0.045, 0.355, 1);
    cursor: pointer;
}

/* Page states */
.page.flipped {
    transform: rotateY(-180deg);
}

/* Front and Back of each page */
.front,
.back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    overflow: hidden;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.1);
}

.front {
    transform: rotateY(0deg);
    border-radius: 2px 8px 8px 2px;
}

.back {
    transform: rotateY(180deg);
    border-radius: 8px 2px 2px 8px;
}

/* Parchment texture inside the book */
.parchment {
    background-color: var(--parchment-base);
    background-image:
        linear-gradient(90deg, rgba(0, 0, 0, 0.15) 0%, rgba(0, 0, 0, 0) 5%, rgba(0, 0, 0, 0) 95%, rgba(0, 0, 0, 0.05) 100%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.6' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
}

/* Specific shading for pages depending on position */
.front::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 10%;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.2) 0%, transparent 100%);
    z-index: 10;
}

.back::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 10%;
    height: 100%;
    background: linear-gradient(to left, rgba(0, 0, 0, 0.2) 0%, transparent 100%);
    z-index: 10;
}

/* 页面边缘（模仿老书） */
.page::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 100%;
    width: 4px;
    height: calc(100% - 4px);
    background: linear-gradient(to right, #cfbd93, #a28f64);
    transform: rotateY(90deg);
    transform-origin: left;
    backface-visibility: hidden;
}

/* =========================================
   3. TYPOGRAPHY & INNER CONTENT (JSTOR / Academic)
   ========================================= */
.page-content {
    padding: 10% 12%;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    scrollbar-width: none;
    /* Firefox */
}

.page-content::-webkit-scrollbar {
    display: none;
}

/* Chrome */

.chapter-title {
    font-family: 'Cinzel', serif;
    font-size: 1.8rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--text-muted);
    padding-bottom: 10px;
    margin-bottom: 30px;
    text-align: center;
}

.page-content p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 20px;
    text-align: justify;
    text-indent: 2em;
}

.drop-cap {
    float: left;
    font-family: 'Playfair Display', serif;
    font-size: 4.5rem;
    line-height: 0.8;
    padding-top: 4px;
    padding-right: 8px;
    padding-left: 3px;
    color: var(--ink-color);
    text-indent: 0 !important;
}

.sketch-figure {
    margin: 30px 0;
    text-align: center;
}

.sketch-box {
    width: 80%;
    height: 180px;
    margin: 0 auto 10px;
    border: 1px dashed var(--text-muted);
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath d='M10,90 L50,10 L90,90 M20,60 L80,60 M50,10 L50,90' stroke='%233b2c24' stroke-width='1' fill='none' stroke-dasharray='4' opacity='0.5'/%3E%3C/svg%3E") no-repeat center center / contain;
}

figcaption {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-muted);
}

.quote-block {
    margin: 30px 10%;
    padding: 20px;
    border-left: 3px solid var(--gold);
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: 1.2rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.03);
}

.page-number {
    position: absolute;
    bottom: 5%;
    width: 100%;
    text-align: center;
    font-family: 'Cinzel', serif;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* =========================================
   4. COVER & STYLING
   ========================================= */
.cover .front {
    background-color: #dcb880;
    /* Mottled parchment cover */
    background-image:
        radial-gradient(circle at center, rgba(235, 220, 178, 0.5) 0%, rgba(150, 110, 60, 0.8) 100%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.04' numOctaves='5' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.4'/%3E%3C/svg%3E");
    background-blend-mode: multiply;
    color: var(--ink-color);
    border: 2px solid #8b6b4a;
    box-shadow: inset 0 0 80px rgba(90, 60, 30, 0.6), 0 10px 30px rgba(0, 0, 0, 0.5);
}

.cover .front::before {
    /* Different spine shading for cover */
    background: linear-gradient(to right, rgba(60, 40, 20, 0.6) 0%, rgba(60, 40, 20, 0.1) 12%, transparent 100%);
}

.cover-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 15%;
    text-align: center;
}

.cover-content h1 {
    font-family: 'Cinzel', serif;
    font-size: 3.5rem;
    line-height: 1.2;
    margin: 20px 0;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.4), -1px -1px 2px rgba(0, 0, 0, 0.2);
    color: var(--ink-color);
}

.author-name {
    font-style: italic;
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.ornament {
    width: 80%;
    height: 30px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 20'%3E%3Cpath d='M10,10 Q25,0 50,10 T90,10' fill='none' stroke='%233b2c24' stroke-width='1.5'/%3E%3Ccircle cx='50' cy='10' r='3' fill='%233b2c24'/%3E%3C/svg%3E") no-repeat center center / contain;
}

.jstor-badge {
    margin-top: 50px;
    border: 1px solid var(--ink-color);
    padding: 10px 20px;
    font-family: 'Cinzel', serif;
    font-size: 0.9rem;
    letter-spacing: 2px;
    color: var(--ink-color);
}

.jstor-badge hr {
    border: none;
    border-top: 1px solid var(--ink-color);
    margin: 5px 0;
}

.cover-back {
    background-color: #dcb880;
    background-image:
        radial-gradient(circle at center, rgba(235, 220, 178, 0.5) 0%, rgba(150, 110, 60, 0.8) 100%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.04' numOctaves='5' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.4'/%3E%3C/svg%3E");
    background-blend-mode: multiply;
    color: var(--ink-color);
    border: 2px solid #8b6b4a;
    box-shadow: inset 0 0 80px rgba(90, 60, 30, 0.6), 0 10px 30px rgba(0, 0, 0, 0.5);
}

.back-text {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: 1.3rem;
    line-height: 2;
    color: var(--ink-color);
}

.center-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.bibliography {
    list-style: none;
    margin-top: 30px;
    width: 90%;
}

.bibliography li {
    margin-bottom: 15px;
    font-size: 0.95rem;
    padding-left: 2em;
    text-indent: -2em;
}

/* =========================================
   5. CONTROLS
   ========================================= */
.book-controls {
    margin-top: 40px;
    display: flex;
    gap: 20px;
    z-index: 100;
}

.nav-btn {
    background: transparent;
    color: var(--ink-color);
    border: 1px solid var(--ink-color);
    padding: 10px 20px;
    font-family: 'Cinzel', serif;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.nav-btn:hover:not([disabled]) {
    background: var(--ink-color);
    color: var(--parchment-base);
}

.nav-btn[disabled] {
    opacity: 0.3;
    cursor: default;
}

/* 响应式调整 */
@media (max-width: 900px) {
    .book {
        width: 90vw;
        height: 70vh;
        /* 在手机上可能只想显示单页阅读，这里做个简化适配，保持3D但不偏移中心 */
        transform: translateX(0);
    }

    .page {
        width: 100%;
        transform-origin: left center;
    }

    .front,
    .back {
        border-radius: 4px;
    }

    .cover-content h1 {
        font-size: 2.5rem;
    }
}